TM 10-4520-259-13&PTESTa.Turn on water heater fuel and power.b.Wait approximately 20 seconds. If audible alarm sounds, go to step i. If blower motor does not comeon and ignition does not occur, proceed to next step.c.Open control box lid (1) and check motor contactors (2). If contactors are tripped, reset contactors andcheck for normal operation. If contactors continue to trip, test motor contactor operation as described in step d.If contactors are not tripped, proceed to step e.CAUTIONEnsure that power is off before making continuity check. Damage to testequipment could result.NOTEIsolate any electrical components before starting continuity check.d.Using the multimeter, check continuity from input terminals to output terminalson motor contactor solenoid (3). Meter should indicate an open circuit at each setof terminals. Push up on motor contactor solenoid. Meter should indicatecontinuity at each set of terminals. Check continuity of relay coil. Multimetershould indicate low resistance. If it registers infinity or 0 ohms, replace contactor.e.Loosen screw (4) on cover (5) and remove cover (5) from flame safeguard control (6) exposing control.5-31